GMC Complaints

Catastrophic engine failure. Engine failed while driving and lost all oil pressure. Nearly cause accident

I bought this vehicle in August 2025 and October was the first incident that this occurred. What happened was I was driving to pick up my husband and all the warning lights on my car dash started going off and then it died. After we got it started again we took it to the nearest GM dealership and after we parked, we could not get it to shut off then when we started driving again, it died in their parking lot. This has happened multiple times since.

Front passenger heated seat caused severe burns to passenger back upper thigh area while using. Passenger was wearing ankle length sweat pants during ride.

seatbelt has come undone on its own multiple times on the drivers seat. nothing was touching or near the red release button when this has occurred. it is not immediately happening but happens while driving. i think its happened five times in the past 1-2 months. i cannot figure out a rhyme or reason. i have never experienced this happen on any vehicle previously.

"Vehicle exhibits a severe RPM flutter and rhythmic harmonic vibration at idle. These symptoms are consistent with manufacturing defects in the connecting rod and crankshaft currently under NHTSA RQ26001 and EA25-007 investigations for the GM 6.2L L87 engine. The defect presents a substantial risk of sudden engine seizure and loss of propulsion while driving. Vehicle is currently out of service at Jim Curley GMC for its first repair attempt. The dealer has stated repairs will not begin for several days."

While using the rear defrost my daughter smelled burning. Moments after the smell the rear window exploded. This is a sliding three part window and it shattered on the passenger side. My daughter was hit by the exploding glass.

On or about Tuesday, February 3, 2026 at 12:20 CST, at the Chevrolet Dealership in Libertyville, IL; I presented my 2023 GMC Sierra to “Manny” at said dealership due to the vehicle INSTRUCTING ME TO DO SO because of DTC codes displayed indicating a failed DEF tank. I was told a technician would be able to diagnose the vehicle that afternoon. MakeModelYearVIN GMCSierra2023 [XXX] Day 1: came and went with no contact from the service department as promised. Day 2: Wednesday, February 4 came with – again – no follow-up from the dealer. When I CALLED I was told there were “no notes in the service order” and “the tech has gone home.” Day 3: Thursday morning “Manny” called to tell me nothing was done and nothing could be done. I was told to “call GM” and complain about my problem. This is how GM treats its customers. This is how GM treats its REPEAT customers. This is how GM treats its customers who BUY THEIR EXTENDED WARRANTIES. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The contact owns a 2021 GMC Canyon. The contact stated that while driving at various speeds, the driver’s side low beam headlight failed to illuminate as intended. No warning light was illuminated. In addition, the contact stated that upon further inspection, an unknown electrical fuse was burned. The vehicle was taken to a local dealer, where it was diagnosed; however, a cause for the failure was not found. The manufacturer was made aware of the failure. The failure mileage was approximately 36,121.

I was driving and the engine abruptly stalled. The truck self-shifted to Neutral. Once stopped, I shifted to Park to attempt a restart. It would not crank. I was on a 2-lane road so I did not have a shoulder. Once I realized it would not restart I tried to shift to Neutral so I could push it to a subdivision road about 50 yards away only to find out my transmission has no ability to shift to Neutral (the dealer confirmed this later). So I was stuck on the road for hours just over the crest of a hill with people coming up on me and my family at 50mph. It was a windy 10 degrees so we could not wait on the side of the road where we would have been safer. This is how people get killed; being stopped where people can't see you and do not expect you to be stopped. Why can I not get the truck off the road? If this happened on an 8-lane highway how would I get to a shoulder, even after traffic had stopped behind me? On top of all that, the problem with the truck ended up being an engine bearing failure (per the dealership service dept) that is a known problem with this engine and truck build date. General Motors needs to proactively diagnose and get these engines replaced before someone gets hurt. There is a TSB issued for the bearing issue but when I asked my dealer about it a month ago, before the failure, they acted like they knew nothing about it and told me to bring it in if I hear noises. If they had offered to check the crankshaft endplay when I asked about it ( as the TSB suggests), I may not have gotten stranded and my family's safety put at risk. There were no warning lamps, and no strange noises before the engine seized. My fuel economy had decreased by about 20% in the last month but that may be from cold weather operating conditions. I have a separate electrical issue that I've been chasing down and I assumed this stall condition was related to that. But the dealer confirmed this was a bearing failure.

While pulling a small trailer to go hunting, the engine just lost all power while merging onto the freeway. I had to pull over to the shoulder in high speed traffic because the truck had no power and had an odd clanking sound. When I took it to the dealer for repair, they stated that the lifter failed and also damaged the cam. This required a full engine rebuild. When the dealer went to test drive the truck with the new parts, ANOTHER lifter failed and also affected the cam again which required another rebuild.